CAT4237 Datasheet, PDF (7/13 Pages) Catalyst Semiconductor – High Voltage CMOS Boost White LED Driver

CAT4237
TYPICAL CHARACTERISTICS
(V_IN = 3.6 V, C_IN = 4.7 mF, C_OUT = 0.22 mF, L = 33 mH with 8 LEDs at 20 mA, T_AMB = 25°C, unless otherwise specified.)
2.0
EN
5V/div
VOUT
1.5
10V/div
1.0
Input
Current
100mA/
0.5
div
50 msec/div
Figure 16. Power−up with 8 LEDs at 20 mA
303
0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
Figure 17. Switch ON Resistance vs. Input
Voltage
1.0
302
301
300
299
298
V_IN = 3.6 V, 8 LEDs
I_LED = 20 mA
297
−50
0
50
100
150
TEMPERATURE (°C)
Figure 18. FB Pin Voltage vs. Temperature
0.8
−40°C
25°C
85°C
0.6
125°C
0.4
0.2
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 19. Shutdown Voltage vs. Input Voltage
140
120
100
VOUT = 15 V
80
60
VOUT = 20 V
40
20
0
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 20. Maximum Output Current vs. Input
Voltage
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